Ntt Docomo, Inc.

Hisayuki Aso

Keisuke Suzuki

Masaki Nishimura

Kazufumi Yunoki

Yoshihiko Omori

Michiko Wakui

Keisuke Sasada

Shinsuke Sawamukai

Reika Higa

Naohiro Sekiya

Yuukichi Saito

An RNC includes: a first call request reception unit configured to receive from an exchange a first call request to only an already located wireless cell; a presumably located wireless cell derivation unit configured to derive a presumably located wireless cell in which a target communication terminal device is presumably located; a first call making unit configured to make a call to the already located wireless cell and the presumably located wireless cell; a call response signal transmission unit configured to transmit a response signal to the call, to the exchange; a second call request reception unit configured to receive from the exchange a second call request to a wireless cell different from the already located wireless cell, in a case where the response signal to the first call request has not been transmitted; and a second call making unit configured to make the call to the different wireless cell.

Exchange, wireless network control device, wireless network device, and wireless communication network system

During communication by a mobile device, when a communication feasibility determining unit of an SGSN determines, based on a remaining communication volume, that the communication by the mobile device cannot be continued, an access point information extracting unit extracts APN information regarding an APN with an unused remaining communication volume and reports the extracted APN information to the mobile device. An access point information acquiring unit of the mobile device acquires APN information regarding the APN with an unused remaining communication volume. When communication is next initiated, the APN information regarding the APN with an unused remaining communication volume is transmitted to the SGSN to perform communication.

Communication system, communication control device, communication method, and mobile device

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Chiyoda-ku, Japan

Hisayuki Aso